NEET Physics (general) MCQ Question
Which of the following statements about semiconductor devices is correct?
Vacuum tubes require a vacuum to prevent energy loss from moving electrons.
Transistors were discovered in 1948 and replaced all vacuum tube applications immediately.
The flow of current in a diode occurs only when it is reverse biased.
Organic semiconductors are the only type of semiconductors used in electronic devices.
Correct Answer
Detailed Explanation
Vacuum tubes, such as diodes and triodes, require a vacuum to ensure that electrons do not lose energy due to collisions with air molecules, as stated in the introduction. Other statements are incorrect as transistors did not replace all vacuum tubes immediately, current only flows in a diode when forward biased, and organic semiconductors are not the only type used.
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